STRUCTURE SHIELDING FROM SIMULATED FALLOUT GAMMA RADIATION.
Final rept., phase 2,
TECHNICAL OPERATIONS INC BURLINGTON MASS
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Two experiments were performed in this second phase of a study designed to evaluate the validity of the current structure shielding theory. The first experiment completed measurements begun earlier of inand down basement radiation. Here, the floor barrier reduction factor presently used to predict basement reduction factors theorectically was found to produce calculations lower, by a factor of between 1.5 and 7, than the experimental results. A new theoretical floor barrier reduction factor, which is a function of both the floor thickness and the solid angle fraction subtended at the detector by the floor, was constructed within the formalism of the existing structure shielding theory. This new function agrees quite well with both experimental results and Monte Carlo calculations, over the entire range of wall and floor thicknesses used in the experiment. The second experiment investigated the assumption that in evaluating the barrier reduction factor an inhomogeneous barrier can be treated theoretically as a homogeneous barrier of appropriate thickness. For the wall thicknesses, rib spacing, and rib size studied, this assumption was found to be quite satisfactory at distances behind the barrier larger than one-half the rib spacing. Author
- Nuclear Radiation Shielding, Protection and Safety